Safety Instructions 7
Safety Instructions
Use the following safety guidelines to protect yourself and your computer. 
For comfort and efficiency, observe the ergonomic guidelines provided in 
the Tell Me How help file.
When Using Your Computer
 CAUTION: Do not operate your computer with any cover(s) 
(including the computer cover, filler brackets, front-panel inserts, 
and so on) removed.
• To help avoid damaging your computer, be sure that the voltage 
selection switch is set to match the AC power available at your 
location:
– 115 V/60 Hz in most of North and South America and some Far 
Eastern countries such as South Korea and Taiwan
– 100 V/50 Hz in eastern Japan and 100 V/60 Hz in western Japan
– 230 V/50 Hz in most of Europe, the Middle East, and the Far East
Also be sure that your monitor and attached devices are electrically 
rated to operate with the AC power available in your location.
• To help avoid possible damage to the system board, wait 5 seconds 
after turning off the computer before disconnecting or connecting a 
non-USB device from the computer.
• To help prevent electric shock, plug the computer and device power 
cables into properly grounded power sources. These cables are 
equipped with 3-prong plugs to help ensure proper grounding. Do not 
use adapter plugs or remove the grounding prong from a cable. If you 
must use an extension cable, use a 3-wire cable with properly grounded 
plugs.